it may very well not be cheating, but considering how i was taught to do them, i personally consider a wide grip cheating. (IMO stands for In My Opinion, and that's all it was, just my opinion).
are you doing pure deadhangs? no kicking of the feet, jerking of the body, swinging of the body, arms full extended at the bottom and held for a quick pause, and chin breaking the plain of the bar on every rep?